Hiked this yesterday and did about 9 miles with all of the side trails we did. We were on the trails for about 5 hours.

But my friend's car was broken into while we were hiking. They broke the glass to get in. Great hike but bad experience!

BTW, contrary to what ayh123 said on 1/13/13, you DO NEED A PERMIT to hike in the fenced preserve during the period of March 1 thru July 31 of each year. Being in the preserve without a permit during this timeframe is a finable offense and rangers do patrol it.

You do not need a permit the rest of the year, and you never need a permit to hike the Bull Creek Park and greenbelt, which is not fenced.